I just finished up a bunch of “Dave's Hubs” for 3mm and 4mm out put shafts and will
be finishing up a few sets for 6mm out put shafts soon .

For anyone who doesn't know about my hubs :

These are for mounting the Lite-Flite foam wheels on an insect class fighting bot
. They can be used with Lite-Flites from 1 3/4" Dia to 3" Dia after the plastic Lite-Flite
hub has been removed and discarded .